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-<pre>public class <span class="typeNameLabel">KafkaProducer<K,V></span>
+<pre>public class <span class="strong">KafkaProducer<K,V></span>
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<div class="block">A Kafka client that publishes records to the Kafka cluster.
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Here is a simple example of using the producer to send records with strings
containing sequential numbers as the key/value
pairs.
<pre>
- <code>
- Properties props = new Properties();
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props.put("bootstrap.servers", "localhost:9092");
props.put("acks", "all");
props.put("retries", 0);
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href="../../../../../org/apache/kafka/clients/producer/Producer.ht
as well as a background I/O thread that is responsible for turning these
records into requests and transmitting them
to the cluster. Failure to close the producer after use will leak these
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record sends
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individual records for efficiency.
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The <code>acks</code> config controls the criteria under which requests are
considered complete. The "all" setting
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<td class="colFirst"><code>void</code></td>
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Values can be
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- <a
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title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
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title="type parameter in KafkaProducer">K</a>> keySerializer,
- <a
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title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>> valueSerializer)</pre>
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title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
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title="type parameter in KafkaProducer">K</a>> keySerializer,
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<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration, a key and a value <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>.
Valid configuration strings are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.
Values can be either strings or Objects of the appropriate type (for example
a numeric configuration would accept
either the string "42" or the integer 42).</div>
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href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't be
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directly.</dd>
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href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't
- be called in the producer when the serializer is
passed in directly.</dd>
-</dl>
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The producer configs</dd><dd><code>keySerializer</code> - The serializer for
key that implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't be
+ called in the producer when the serializer is passed in
directly.</dd><dd><code>valueSerializer</code> - The serializer for value that
implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
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<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration. Valid configuration strings
are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.</div>
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<pre>public KafkaProducer(<a
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title="class or interface in java.util">Properties</a> properties,
- <a
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title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
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title="interface in org.apache.kafka.common.serialization">Serializer</a><<a
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title="type parameter in KafkaProducer">V</a>> valueSerializer)</pre>
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<div class="block">A producer is instantiated by providing a set of key-value
pairs as configuration, a key and a value <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>.
Valid configuration strings are documented <a
href="http://kafka.apache.org/documentation.html#producerconfigs";>here</a>.</div>
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title="interface in
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title="interface in
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passed in directly.</dd>
-</dl>
+<dl><dt><span
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that implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't be
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directly.</dd><dd><code>valueSerializer</code> - The serializer for value that
implements <a
href="../../../../../org/apache/kafka/common/serialization/Serializer.html"
title="interface in
org.apache.kafka.common.serialization"><code>Serializer</code></a>. The
configure() method won't
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<h4>send</h4>
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title="class or interface in java.util.concurrent">Future</a><<a
href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html"
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href="../../../../../org/apache/kafka/clients/producer/ProducerRecord.html"
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title="type parameter in KafkaProducer">K</a>,<a
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title="type parameter in KafkaProducer">V</a>> record)</pre>
<div class="block">Asynchronously send a record to a topic. Equivalent to
<code>send(record, null)</code>.
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href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#send-org.apache.kafka.clients.producer.ProducerRecord-org.apache.kafka.clients.producer.Callback-"><code>send(ProducerRecord,
Callback)</code></a> for details.</div>
+ See <a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html#send(org.apache.kafka.clients.producer.ProducerRecord,%20org.apache.kafka.clients.producer.Callback)"><code>send(ProducerRecord,
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-<dd><code>record</code> - The record to send</dd>
-<dt><span class="returnLabel">Returns:</span></dt>
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title="type parameter in KafkaProducer">K</a>,<a
href="../../../../../org/apache/kafka/clients/producer/KafkaProducer.html"
title="type parameter in KafkaProducer">V</a>></code></dd>
+<dt><span class="strong">Parameters:</span></dt><dd><code>record</code> - The
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href="../../../../../org/apache/kafka/clients/producer/ProducerRecord.html"
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title="type parameter in KafkaProducer">K</a>,<a
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- <a
href="../../../../../org/apache/kafka/clients/producer/Callback.html"
title="interface in
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+ <a
href="../../../../../org/apache/kafka/clients/producer/Callback.html"
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<div class="block">Asynchronously send a record to a topic and invoke the
provided callback when the send has been acknowledged.
<p>
The send is asynchronous and this method will return immediately once the
record has been stored in the buffer of
@@ -429,14 +396,13 @@ implements <a
href="../../../../../org/apache/kafka/clients/producer/Producer.ht
topic, the timestamp will be the Kafka broker local time when the message is
appended.
<p>
Since the send call is asynchronous it returns a <a
href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true";
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title="class or interface in java.util.concurrent"><code>get()</code></a> on
this future will block until the associated request completes and then return
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title="class in
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assigned to this record. Invoking <a
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this future will block until the associated request completes and then return
the metadata for the record
or throw any exception that occurred while sending the record.
<p>
If you want to simulate a simple blocking call you can call the
<code>get()</code> method immediately:
<pre>
- <code>
- byte[] key = "key".getBytes();
+ <code>byte[] key = "key".getBytes();
byte[] value = "value".getBytes();
ProducerRecord<byte[],byte[]> record = new
ProducerRecord<byte[],byte[]>("my-topic", key, value)
producer.send(record).get();
@@ -446,8 +412,7 @@ implements <a
href="../../../../../org/apache/kafka/clients/producer/Producer.ht
will be invoked when the request is complete.
<pre>
- <code>
- ProducerRecord<byte[],byte[]> record = new
ProducerRecord<byte[],byte[]>("the-topic", key, value);
+ <code>ProducerRecord<byte[],byte[]> record = new
ProducerRecord<byte[],byte[]>("the-topic", key, value);
producer.send(myRecord,
new Callback() {
public void onCompletion(RecordMetadata metadata, Exception
e) {
@@ -465,8 +430,7 @@ implements <a
href="../../../../../org/apache/kafka/clients/producer/Producer.ht
following example <code>callback1</code> is guaranteed to execute before
<code>callback2</code>:
<pre>
- <code>
- producer.send(new ProducerRecord<byte[],byte[]>(topic, partition, key1,
value1), callback1);
+ <code>producer.send(new ProducerRecord<byte[],byte[]>(topic, partition,
key1, value1), callback1);
producer.send(new ProducerRecord<byte[],byte[]>(topic, partition, key2,
value2), callback2);
</code>
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expensive callbacks it is recommended to use your own <a
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execute when the record has been acknowledged by the server (null
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This example shows how to consume from one Kafka topic and produce to another
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<pre>
- <code>
- for(ConsumerRecord<String, String> record: consumer.poll(100))
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Note that the above example may drop records if the produce request fails. If
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If the producer is unable to complete all requests before the timeout
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@@ -602,16 +559,13 @@ implements <a
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for pending send requests to complete.</dd>
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maximum time to wait for producer to complete any pending requests. The value
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for pending send requests to complete.</dd><dd><code>timeUnit</code> - The time
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